激光焊接不锈钢H形截面轴压短柱截面承载力研究  

Study on cross-sectional bearing capacity of laser-welded stainless steel H-section stub columns under axial compression

作　　者：冉红东[1,2] 陈展鹏 贺垚垚 马云美[3] 孙瑶 RAN Hongdong;CHEN Zhanpeng;HE Yaoyao;MA Yunmei;SUN Yao(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China;China Northwest Architecture Design and Research Institute Co.,Ltd,Xi’an 710018,China;Department of Civil Engineering,Xi’an Jiaotong-Liverpool University,Suzhou 215123,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]中国建筑西北设计研究院有限公司,陕西西安710018 [4]西交利物浦大学土木工程系,江苏苏州215123

出　　处：《建筑结构学报》2024年第2期226-236,共11页Journal of Building Structures

基　　金：陕西省自然科学基金面上项目(2018JM5123)。

摘　　要：为研究激光焊接奥氏体不锈钢H形截面轴心受压构件截面承载性能,对9根激光焊接不锈钢H形截面短柱进行轴心受压试验,分析了紧凑和薄柔截面短柱的截面承载力和组成板件的局部稳定性能。试验结果表明:紧凑截面短柱存在较明显的应变硬化阶段,其极限承载力高于全截面屈服承载力;而薄柔截面短柱由于板件局部屈曲,其极限承载力低于全截面屈服承载力。利用ABAQUS建立了短柱有限元数值模型,基于短柱试验结果验证了有限元模型的适用性,并对激光焊接不锈钢H形截面轴压短柱开展参数分析,研究了局部几何初始缺陷和焊接残余应力对短柱截面承载性能的影响。结合试验和有限元数值分析结果,对CECS 410:2015《不锈钢结构技术规程》轴心受压构件截面承载力设计公式进行评估,结果表明,我国现行规范设计结果普遍偏保守。通过应变硬化影响系数和修正有效宽度折减计算系数对CECS 410:2015中相关计算公式进行修正,修正后公式能够准确预测焊接不锈钢H形截面轴心受压构件截面承载力。In order to study the cross-sectional bearing capacity of laser-welded austenitic stainless steel H-section members under axial compression,nine laser-welded stainless steel H-section stub columns were axially loaded,and the cross-sectional bearing capacity of stub columns with stocky and slender sections and the local stability performance of the constituent plates were analyzed.The test results indicate that there is a significant strain hardening stage in the stub columns with stocky sections,and the cross-sectional ultimate bearing capacity is higher than cross-sectional yield bearing capacity.However,due to local buckling of the constituent plates,the cross-sectional ultimate bearing capacity of the stub columns with slender sections is lower than the cross-sectional yield bearing capacity.ABAQUS was used to establish a stub column model,whose applicability was verified by test results,and parametric analysis was carried out to study the influence of local geometric initial imperfections and welding residual stress on the stub column cross-sectional bearing capacity.Based on the test data and FE results,the local stability loading capacity calculation formula in Chinese code CECS 410:2015‘Technical specification for stainless steel structures’was evaluated,and the results show that the current code is generally conservative.Through the introduction of strain hardening influence coefficient and the effective width reduction coefficient,the calculation formula in current code was revised.The revised design formula can accurately predict the cross-sectional bearing capacity of welded stainless steel H-section axial compressive members.

关 键 词：不锈钢短柱 激光焊接 静力试验 有限元分析 局部稳定 截面承载力 应变硬化 

分 类 号：TU391[建筑科学—结构工程]